[wasm] Int64Lowering of Word64Popcnt.

src/compiler/wasm-compiler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/wasm-compiler.h"
 
 #include "src/isolate-inl.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ skipping 816 matching lines @@
       break;
     // kExprI64UConvertI32:
     case wasm::kExprI64UConvertI32:
       op = m->ChangeUint32ToUint64();
       break;
     // kExprF64ReinterpretI64:
     // kExprI64ReinterpretF64:
     // kExprI64Clz:
     // kExprI64Ctz:
     // kExprI64Popcnt:
+    case wasm::kExprI64Popcnt: {
+      if (m->Word64Popcnt().IsSupported()) {
+        op = m->Word64Popcnt().op();
+      } else if (m->Is32() && m->Word32Popcnt().IsSupported()) {
+        op = m->Word64PopcntPlaceholder();
+      } else {
+        return BuildI64Popcnt(input);
+      }
+      break;
+    }
     // kExprF32SConvertI64:
     case wasm::kExprI64Eqz:
       op = m->Word64Equal();
       return graph()->NewNode(op, input, jsgraph()->Int64Constant(0));
     case wasm::kExprF32SConvertI64:
       if (m->Is32()) {
         return BuildF32SConvertI64(input);
       }
       op = m->RoundInt64ToFloat32();
       break;
@@ skipping 51 matching lines @@
         op = m->Word64Ctz().op();
         break;
       } else if (m->Word64ReverseBits().IsSupported()) {
         Node* reversed = graph()->NewNode(m->Word64ReverseBits().op(), input);
         Node* result = graph()->NewNode(m->Word64Clz(), reversed);
         return result;
       } else {
         return BuildI64Ctz(input);
       }
     }
-    case wasm::kExprI64Popcnt: {
-      if (m->Word64Popcnt().IsSupported()) {
-        op = m->Word64Popcnt().op();
-        break;
-      } else {
-        return BuildI64Popcnt(input);
-      }
-    }
 #endif
     default:
       op = UnsupportedOpcode(opcode);
   }
   return graph()->NewNode(op, input);
 }
 
 
 Node* WasmGraphBuilder::Float32Constant(float value) {
   return jsgraph()->Float32Constant(value);
@@ skipping 1721 matching lines @@
         static_cast<int>(function.code_end_offset - function.code_start_offset),
         decode_ms, static_cast<int>(graph.NodeCount()), compile_ms);
   }
   return code;
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8